Escapement mechanism for typewriters



o w g l wm 5 t Q Q m 1h s m Q R Q m x. QN 3 h b S 4 O. A. HOKANSON ESCAPEMENT MECHANISM FOR TYPEWRITERS Flled May 10, 1924 April 26 1927.

April 26 1927.

O. A. HOKANSON ESCAPEMENT MECHANISM FOR TYPEWRITERS Filed May 10. 1924 4 Sheets-Sheet 2 W w M W April 26, 1927. 1,625,890

' o. A. HOKANSON ESCAPEMENT MECHANISM FOR TYPEWRITEHS Filed May 10. 1924 4 Sheets-Sheet 3 April 26, 1921. 1,625,890

0. A. HOKANSON ESCAPEMENT MECHANISM FOR TYPEWRITERS Filed May 10. 1924 4 Sheets-Sheet 4 Patented Apr. 26, 1927.

UNITED STATES A PATENT OFFICE.

o'r'ro A. nonnson, or woonsrocx, ILLINOIS, ASSIGNOR ro woons'rocx TYPE- warren comrm, or woons'rocx, rumors, A CORPORATION or ILLINOIS.

Application filed May 10, 1924. Serial 110. 712,181.

This invention relates to mechanism for controlling the platen carriage for letter space movement and has for its object the provision of such mechanism which shall be adaptable both for hand and power actuation, and which shall be of improved construction and operation.

- The invention is exemplified in the combination and arrangement of parts shown in the accompanying drawin s and described in the following specification, and it is more particularly pointed out in the appended claims.

' In the drawings Fig. 1 is a vertical sectional view of a portion of a typewriting machine showing one form of escapement mechanism comprised in the present invention;

Fig. 2 is a section substantially on line 22 of Fig. 1;

Fig. 3 is a horizontal section substantially on line 33 of Fig. 2; a

Fig. 4 is a sectional detail;

Fig. 5 is a vertical sectional view showing the power. driven line spacing mechanism for operating the escapement mechanism shown in Figs. 1 and 2; and

Fig 6 is a horizontal sectional view of the line spacing lever connection.

As shown in Figs. 1 and 2, the numeral 10 designates the top frame of a typewriting machine, such as the Woodstock typewriter. J ournaled in the frame 10 is a spindle 11 having apinion 12 secured thereto and an escapement wheel 13 loosely jour-- naled thereon. The escapement wheel 13 carries spring-pressed dogs 14 which engage the teeth of the pinion 12 and (prevent relative rotation ofthe pinion an escapement wheel in one directiorn'but permitting relative rotation in the opposite direction.

The pinion 12 meshes with a rack 15 secured to the movable platen carriage, not shown. Extending downwardly from the frame 10 are posts 16 and 17 which carry ivot screws '18. A- rocking frame 19 havmg downwardly extending arms 20 is pivoted on the screws 18. Pivotally connected to the lower ends of the arms 20 are the arms 21 of a universal-bar frame 22. The frame 22 may be oscillated in any usual manner. when the type bars are operated. One construction of frame for this urpose,

I together with its connection with e type bars, is shown in Patent No. 1,276,118.

A dog rocker 23 is pivotally supported by cars 24 which engage pivot screws 25 carried on the posts 16 and 17; The dog rocker 23 has a pair of stop screws 26 which engage a bracket 27 projecting inwardly from the posts 16, thus limiting the oscillation of the dog rocker. Mounted on the dog rocker 23 is a fixed dog 28 which is adjustably carried by a slotted arm 29 and held in its adjusted position by screws 30.

A limber-dog 31 is provided with a slot 32 pivoted on a screw 33 supported by the dog rocker 23. A spring 34 normally urges the limber-dog 31 upwardly and in a clockwise direction, as viewed in Fig. l. The limber-dog 31 may be slid downwardly by a lever 35 pivotally mounted at 36 on the bracket 27 and having a nosepiece 37 which projects intopposition above a shoulder 38 on the limber-dog 31. The lever 35 may be operated by a roller 39 carried by a lever arm 40 connected with suitable operating mechanism. such as is commonly employed for tabulating. A spring 40 holds the lever 35 against the roller 39.

It will be seen that when the nosepiece 37 is moved downwardly the limber-dog will be out of engagement with the teeth of the ratchet wheel to release the platen carriage for tabulation. hen this occurs the lug 41on the lower end'ot the limber-dog will engage a stop 42 on-the dog rocker to hold the limber-dog from being rotated about its pivotal support by the spring 34. A reverse lock 43 for the escapement wheel is pivotally mounted at 44 on the dog rocker 23 and is held against a stop 45 by a spring 46.

As shown in Fig. 4. the stop 43 is loosely mounted on the pivot screw 44 so that it has motion not only about the axis of the screw, but has a limited movement in a direction transverse to the axis thereof so that the top end of the stop is free to move laterally away from the face of the escapement wheel 13. The spring 46 not only holds the stop against the screw 45. but also pulls it toward the face of thedogroeker to retain it in alinement with the plane of the escapement wheel. a

When the carriage is being returned to begin a new line the rack 15 willmove to the and the stop 43 will positively prevent any reverse rotation of the escapement wheel.

During letterspace movement or when the carriage is moved by its spring for tabulation the rack will more to the right, as

viewed in Fig. l, and the movement will'be controlled bythe escapement wheel 13. The stop 43 will not prevent rotation of the escapement wheel in this direction since the spring 46 will permit the stop to yield to the teeth of the escapement wheel. When the rack is controlled by the dogs 28 and 31 for letter spacing the stop 43 will move with the dog rocker and in case it should strike the lateral face of one of the teeth of the escapement wheel, the lateral .yielding movement of the stop will prevent any interference with the oscillation of the dog rocker and the control of the escapement do p The dog rocker 23 is operated from the universal bar 22 by a bracket 47 which engages a screw 48 mounted on the dog rocker. The screw 48 also carries the stop member 45. Whenever the universal bar, is moved rearwardly by the type bars the bracket 47 will impart a hammer blow to the screw 48 under the influence of the type bars, thus imparting a rapid action to'the control dogs and roviding quick movement of the letter spaomg parts. The dog rocker is returned after operation of the universal bar by a spring 49 attached at.50 to the dog rocker and having its opposite ends secured to a bar 51 passing through the post 17 and held in adjusted positions by a screw 52. .Limit stops for the rocker frame 19 are provided independently of the stops for the dog rocker 23. The stops for the rocker frame 19 comrise a screw 53 carried in the frame 10, the ead of the screw being interposed in the path of a flange 54 on the frame 19. The movement in the opposite direction is limited by a screw 55 carried by the frame 19 and 45 arranged to strike the lower face of the frame member" 10. V The carriage may be spaced independently of the universal bar 22 for spacing between words or at other times when the type bars are not operated. .This spacinf movement is performed by power actuate j *mechanism shown in Fig. 5 and controlled by 'space levers 56 and 57 shown in Figs. 5 and 6. The power driven mechanism comprises a motor driven gear wheel 58 arran to mesh with a mutilated gear 59. .Apa'ir of rollers 69, and 61 are'j carried by the lateral face of the gear 59 and a spring 62 engages the-lowermost roller tending to rotate the mutilated gear to bring the teeth, thereon into mesh with the teeth ofthe'power driven gear 58.

Anescapeme'nt dog 63 has a stop member '64 thereon interposed in. the path of the roller 61 to prevent rotation of e mutilated A. plunger bar is pivoted at extending transversely of the frame of the the escapementdog 63 and extends into the path of a lug 67 on the space lever 56. The space levers 56 and 57 carry a space bar 68 and when this bar is depressed the stop 64 will be moved away from the rollerpermitting rotation of the mutilated gear 59 until it is brought into driving relation with the driving gear 58. Further rotationis then produced by the power driven gear until the teeth of the power driver gear rcgis- 7 ter with a blank portion of the mutilated gear. .Rotation is then checked either by the nose 69 of the escapement dog or by the stop 64 depending on whether or not the spacing lever is still depressed.

When the mutilated gear 59 is rotated by the power driven gear the roller 61 strikes a cam face 70 on an actuating lever 71 and depresses the actuating lever. The lever 71 is pivoted at 72 on a cross-bar 7 3 and is held 55 in its upper position by a spring 74. The rear end of the lever 71 carries a pin 75 which engages a slot 76 on a lever 77 piw oted at 78 on a cross-bar 79. The cross-bar 79 carries a bracket 80 having a lever 81 pivoted at 82 thereon. A pin and slot connection 83 provides operative connection between the levers 77 and 81. The upper end of the lever 81 has a link 84 pivoted at 85 thereon and the opposite end of the link 84 95 is pivotally connected at 86 to an extension 87 on the dog rocker 23, as shown in Figs. 1 and 2,

1t will'be apparent that whenthe space bar 68 is depressed to permit operation of the actuating lever 71 from the power driven mechanism the link 84 will be oscillated forwardly to impart an oscillation to the do rocker and thus release the escapement whee for rotation by an amount corresponding to one tooth thereof for each depression of the space bar. The actual operation of the escapement mechanism is performed by the power drive and the force required to depress the space, baris only that necesary to release the stop 64 from engagement with the roller 61.

The space levers 56 and 57 are secured to a rock shaft 88 pivoted in brackets 89' and 5 machine. A spring 90 holds the space levers in their uppermost position. The pivot 82 to which the lever 81 is secured is in the form of a rock shaft, as shown in Fig. 6, in order to bring the link 84 near the center of no the machine. 7

Theplunger 65 -is ided by an angle bar 91 pivotally mounte at 92 on plates 93 at each side of the machine. The plates'93 are pivotally esppported at 94 and one of 125 the plates carries a pin 95 which cooperates with a cam "move- 96 in a plate 97. The

plate 97- ivoted at 98 and is provided with a ban lever 99 by which it ma be rocked upon its pivot 98. Movement og be lever '95] rcarwardly will force the .pin 95 downwardly andmove the angle bar 91 forwardly to bring the plunger 65 out of registration with the projection 67 on the lever 56. When the parts are in this position operation of the space lever 56 will cause the pin 100 to strike the upper member forming the slot 76 and thus oscillate the lever 7'?- to produce a letter space movement of the platen carriage.

' I claimy.

1. In a typewriter, the combination with escapement mechanism. ofa universal memberfor actuating said escapement mechanism, power actuated means for operating said escapement mechanism independentl y of said universal member, a space lever for controlling said power actuated means and driving connection between said power-actuated means and escapement mechanism separate from said spacelever,

2. In a typewritingmachine, escapement mechanism comprising a dog rocker, a uni- -versal member for moving said dog rocker,

power driven mechanism for moving said dogrocker" independent of said universal member, a space leverfor controlling.-said said esca ement member, means for moving said'lim )er-dog out of operative position, and a .stop for holding said limber dog against movement to advanced position when out of operative position. ,7

f}. In a typewriting machine, escapement mechanism comprising an escapement wheel, a fixed do a limber-dog, a spring for holding said Iimber-d'og in operative relation with said escapement wheel and for pivotally moving said dog from a retracted to an advanced position relative to said escape-' ment wheel. means for moving said limberdog out of operative relation with said escapement wheel, and a stop for holding said limber-dog against pivotalmovement in itsretracted position when out of oper ative relation with said escapement wheel.

5. In a typewriter, escapement mechanism comprising an escapement wheel, a sto for preventing reverse movement of sai escapement wheel, and a do rocker on which said stop is mounted, sai stop being movable relative to said dog rocker in the direction of movement of said escapement wheel and also transversely thereto. 7

6. In a typewriter, escapement mechanism comprising an escapement wheel, a dog rocker, dogs thereon for controlling the rotation of said escapement wheel, a stop on said dog rocker for preventing reverse rotation of said escapement wheel, said stop pivoted to move in a direction parallel to the plane of said escapementwheel and also transversely to the plane of said escapement wheel, and a spring for holding said stop inoperative relation with said escapement wheel.

7 In a'typewriter, escapement mechanism comprising an escapement wheel, dogs for controlling the rotation of said escapement wheel, a dog rocker-for actuating said dogs,

a universal member arranged to strike said dog rocker to impart oscillation thereto,

stops for limiting the movement of said dog rocker, and separate stops for. limiting the movement of said universal member.

8. In a typewriting machine, escapement mechanism comprising a dog rocker, a'universal memberfor actuating said'dog rocker, stops for limitingthe movement of said universal member,- stops for limiting the",

movement of said dogrocker independently of said universalmember, and a power ac- .tuateddevice for actuating said dog'rocker independently of said universal member.

9. In a typewriting machine, escapement mechanism, a power drive, means for connectmg' sald power drive with said escapement mechanism to produce letter space -movement, a control for said connecting means, a hand lever for operating said control,. means for operating said escapement mechanism from said hand lever,

said control being movable out of operative loo relation with saidhand lever 'topermit operation of said escapement mechanism by said hand lever independently of said power drive.

- i. In testimony whereof I have signed my name to this specification on this 7th day of May, A. 1924. p

o'rro A HoKANson; 

